Enter a sender cost center or a group

What causes this issue?

In activity input planning, you can access planning either with an
individual cost center or with a group of cost centers. However, you
cannot use both to access planning.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Delete either the cost center or the cost center group, or
enter a value in one of the two fields.

Error message extract from SAP system. Copyright SAP SE.